Connecting structure for tube

Abstract

An oil feeding device includes a tube body formed of metal and having a tube connecting part, and a connection pipe formed of resin and having a pipe connecting end. A press-fitting member and a seal member are clamped between the tube connecting part and the pipe connecting end. The press-fitting member includes a press-fitting body having a cylindrical outer peripheral face, which is fitted to an outer periphery of the tube connecting part, and claws which are formed at one end of the press-fitting body. The pipe connecting end is provided with a reduced diameter part which is formed by annularly reducing a diameter of a part of the pipe connecting end. The reduced diameter part retains the pipe connecting end, in engagement with the claws, by being formed by plastic deformation before or after the pipe connecting end is connected to the tube connecting part.

What is claimed is:  
     
       1. A connecting structure, comprising:
 a tube body made of metal and having a tube connecting part, the tube connecting part having an annular ridge with an inclined surface for sealing, 
 a connection pipe made of resin having a pipe connecting end, the tube connecting part being inserted into the connection pipe, and the pipe connecting end covering the tube connecting part, 
 a press-fitting member having a tube shape being clamped between the tube connecting part and the pipe connecting end, 
 a seal member that is positioned at one end of the press-fitting member and interposed between the pipe connecting end and the tube connecting part for sealing, wherein 
 the press-fitting member consists essentially of a resin material and is arranged between an outer peripheral part of the tube connecting part and an inner wall of the pipe connecting end, the press-fitting member including a press-fitting body having:
 claws arranged at one end of the press-fitting body and at a plurality of positions in a circumferential direction of the press-fitting member, each of the claws having a first smooth outer annular surface extending in an axial direction of the press-fitting member and at a constant radial distance from an axis of the press-fitting member, and 
 a cylindrical outer peripheral face having a second smooth outer annular surface extending in the axial direction of the press-fitting member and at the constant radial distance of the first smooth outer annular surface and being flush with the first smooth outer annular surface of the claws, 
 
 the press-fitting member being press-fit onto the outer peripheral part of the tube connecting part and the claws biting an inner wall of the pipe connecting end, 
 the pipe connecting end includes a reduced diameter part with an annularly reduced diameter relative to other parts of the pipe connecting end, the reduced diameter part of the pipe connecting end having a structure and being arranged to retain the pipe connecting end in engagement with the claws of the press-fitting member, 
 the tube connecting a part has an outer peripheral part with an annular retaining ridge and at least one rotational detent including an outwardly radially extending protrusion 
 the press-fitting member has an inner peripheral part with an annular engaging portion and at least one engaging detent portion including a hole having a shape corresponding to the shape of the outwardly radially extending protrusion, 
 the annular engaging portion of the press-fitting body engages the annular retaining ridge of the tube connecting part, engagement of the annular engaging portion of the press-fitting member with the annular retaining ridge of the tube connecting part prevents axial movement of the press-fitting member with respect to the tube connecting part, and 
 the at least one engaging detent portion of the press-fitting body engages the at least one rotation detent of the tube connecting part, and engagement of the at least one engaging detent portion of the press-fitting member and the at least one rotation detent of the tube connecting part prevents rotation of the press-fitting member with respect to the tube connecting part. 
 
     
     
       2. The connecting structure as claimed in  claim 1 , wherein the claws extend in an axial direction of the press fitting member and are pressed into an inner wall of the reduced diameter part and restrain the pipe connecting end from rotating. 
     
     
       3. The connecting structure as claimed in  claim 1 , wherein the press-fitting member comprises divided bodies having a semi-circular sectional shape that are assembled together to form a unified press-retaining member, the divided bodies being divided into the semi-circular sectional shape along an axial direction of the press-fitting member. 
     
     
       4. The connecting structure as claimed in  claim 1 , wherein one end of the seal member is positioned in an end part of the tube connecting part, and the one end of the seal member is adjacent the annular ridge having the inclined face inclined toward an outer peripheral face of the seal member that is provided in the end part of the tube connecting part. 
     
     
       5. The connecting structure as claimed in  claim 1 , wherein a lower end of the press-fitting member has an end face for positioning the seal member. 
     
     
       6. The connecting structure as claimed in  claim 1 , wherein the seal member comprises an O-ring. 
     
     
       7. The connecting structure as claimed in  claim 1 , wherein the seal member is positioned adjacent the inclined surface of the annular ridge of the connecting part. 
     
     
       8. The connecting structure as claimed in  claim 1 , wherein the seal member comprises an O-ring that is positioned adjacent the inclined surface of the annular ridge of the connecting part. 
     
     
       9. A connecting structure as claimed in  claim 1 , wherein the connecting structure is a connecting structure for an oil feeding device for feeding fuel. 
     
     
       10. An oil feeding device for feeding fuel comprising the connecting structure as claimed in  claim 1 .